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        <p>在研究安卓安全时，很多情况下我们需要修改安卓源代码（如动态调试时过掉反调试机制）。LineageOS是根据Android官方源码修改后的版本，对很多手机都适配，因此编译该版本的源码比直接编译AOSP的更加有意义。本文简要说明一下编译LineageOS的步骤。更详细的步骤说明请参考官方文档: <a href="https://wiki.lineageos.org/build_guides.html" target="_blank" rel="noopener">https://wiki.lineageos.org/build_guides.html</a></p><a id="more"></a>
<p>首先说明一下我这的操作系统和需要编译的LineageOS版本<br>操作系统版本：<br><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">Linux anemone-VirtualBox 4.13.0-26-generic <span class="comment">#29~16.04.2-Ubuntu SMP Tue Jan 9 22:00:44 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux</span></span><br></pre></td></tr></table></figure></p>
<p>编译的LineageOS版本<br><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br></pre></td><td class="code"><pre><span class="line">============================================</span><br><span class="line">PLATFORM_VERSION_CODENAME=REL</span><br><span class="line">PLATFORM_VERSION=7.1.2</span><br><span class="line">LINEAGE_VERSION=14.1-20180325-UNOFFICIAL-mako</span><br><span class="line">TARGET_PRODUCT=lineage_mako</span><br><span class="line">TARGET_BUILD_VARIANT=userdebug</span><br><span class="line">TARGET_BUILD_TYPE=release</span><br><span class="line">TARGET_BUILD_APPS=</span><br><span class="line">TARGET_ARCH=arm</span><br><span class="line">TARGET_ARCH_VARIANT=armv7<span class="_">-a</span>-neon</span><br><span class="line">TARGET_CPU_VARIANT=krait</span><br><span class="line">TARGET_2ND_ARCH=</span><br><span class="line">TARGET_2ND_ARCH_VARIANT=</span><br><span class="line">TARGET_2ND_CPU_VARIANT=</span><br><span class="line">HOST_ARCH=x86_64</span><br><span class="line">HOST_2ND_ARCH=x86</span><br><span class="line">HOST_OS=linux</span><br><span class="line">HOST_OS_EXTRA=Linux-4.13.0-26-generic-x86_64-with-Ubuntu-16.04-xenial</span><br><span class="line">HOST_CROSS_OS=windows</span><br><span class="line">HOST_CROSS_ARCH=x86</span><br><span class="line">HOST_CROSS_2ND_ARCH=x86_64</span><br><span class="line">HOST_BUILD_TYPE=release</span><br><span class="line">BUILD_ID=NJH47F</span><br><span class="line">OUT_DIR=/media/anemone/lineage/lineageOS/out</span><br><span class="line">WITH_SU=<span class="literal">true</span></span><br><span class="line">============================================</span><br></pre></td></tr></table></figure></p>
<p>顺带可以看到我这里需要编译的Android版本是7.1.1, 目标设备是Nexus4手机。</p>
<h1 id="搭建编译环境"><a href="#搭建编译环境" class="headerlink" title="搭建编译环境"></a>搭建编译环境</h1><p>安装jdk<br><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">sudo apt-get update</span><br><span class="line">sudo apt-get install openjdk-8-jdk</span><br></pre></td></tr></table></figure></p>
<p>安装编译时需要依赖的库<br><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">sudo apt-get install bc bison build-essential curl flex g++-multilib gcc-multilib git gnupg gperf imagemagick lib32ncurses5-dev lib32z1-dev libesd0-dev liblz4-tool libncurses5-dev libsdl1.2-dev libwxgtk3.0-dev libxml2 libxml2-utils lzop pngcrush schedtool squashfs-tools xsltproc zip zlib1g-dev openjdk-8-jdk lib32readline6-dev</span><br></pre></td></tr></table></figure></p>
<h1 id="下载源代码"><a href="#下载源代码" class="headerlink" title="下载源代码"></a>下载源代码</h1><p>安装repo工具<br><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">curl https://mirrors.tuna.tsinghua.edu.cn/git/git-repo -o repo</span><br><span class="line">chmod +x repo</span><br></pre></td></tr></table></figure></p>
<p>为了方便可以将其拷贝到你的PATH里。</p>
<p>使用repo命令下载源代码（可能涉及到科学上网）<br><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">repo init -u git://github.com/LineageOS/android.git -b cm-14.1</span><br><span class="line">repo sync -f --force-sync --no-clone-bundle</span><br></pre></td></tr></table></figure></p>
<h1 id="提取设备文件"><a href="#提取设备文件" class="headerlink" title="提取设备文件"></a>提取设备文件</h1><p>虽然Android是开源的，但是有些设备的文件不是通用的（如不开源的驱动文件），有2种方法提取：1，从刷好相同版本的LineageOS设备中获取，2，从已经编译好的LineageOS卡刷包中获取。这里介绍第二种，假设我们已经下好的卡刷包为<code>path/to/lineage-xxx.zip</code>。</p>
<figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line">mkdir ~/android/system_dump/</span><br><span class="line"><span class="built_in">cd</span> ~/android/system_dump/</span><br><span class="line">unzip path/to/lineage-*.zip system.transfer.list system.new.dat</span><br><span class="line">git <span class="built_in">clone</span> https://github.com/xpirt/sdat2img</span><br><span class="line">python sdat2img/sdat2img.py system.transfer.list system.new.dat system.img</span><br><span class="line">mkdir system/</span><br><span class="line">sudo mount system.img system/</span><br><span class="line">./extract-files.sh ~/android/system_dump/</span><br></pre></td></tr></table></figure>
<p>将system_dump文件下的文件复制到<code>~/android/lineage/vendor/lge</code>文件夹下。</p>
<h1 id="编译"><a href="#编译" class="headerlink" title="编译"></a>编译</h1><p>准备工作做完后就可以开始愉快的编译啦~~，不过在由于Android工程巨大，请确保编译的机器拥有不低于10G的内存(亲测虚拟机内存8G，swap 8G可以编译)，一个速度足够快的硬盘（再来一个固态当缓冲就更好啦），当然还有一个好的CPU（我这用的是i7-4700HQ, 应该算比较差的编译环境了，整个编译过程需要3个小时）。<br><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line">. build/envsetup.sh</span><br><span class="line"><span class="built_in">export</span> WITH_SU=<span class="literal">true</span>    <span class="comment">#自带root</span></span><br><span class="line"><span class="built_in">export</span> JACK_SERVER_VM_ARGUMENTS=<span class="string">"-Dfile.encoding=UTF-8 -XX:+TieredCompilation -Xmx10G"</span>    <span class="comment">#设置编译内存</span></span><br><span class="line">breakfast lineage_mako-userdebug <span class="comment">#选择设备内核</span></span><br><span class="line"><span class="built_in">export</span> USE_CCACHE=1 <span class="comment">#使用缓存</span></span><br><span class="line"><span class="built_in">export</span> CCACHE_DIR=/media/anemone/anemone_ssk/ccache <span class="comment">#缓存地址</span></span><br><span class="line">./prebuilts/misc/linux-x86/ccache/ccache  -M 100G    <span class="comment">#使用100G作为缓存空间</span></span><br><span class="line">brunch lineage_mako-userdebug</span><br></pre></td></tr></table></figure></p>

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